使用 AsyncTask() 进行多线程：使用 wait() 和 notify()

Question

I am having hard time to understand how multitasking works in Java. I read some articles here on SO but still have problems.

I have my Main class, in which I execute AsyncTask, and I would like to stop code execution of main class until the AsyncTask is finished. In AsyncTask I gather data from internet. I would like to gather data, get the result, and notify in onPostExecute() method. Here is simplified code:

public class MainClass extends Activity  {

    public class MyTask extends AsyncTask<String, Void, String> 
    {
        @Override
        protected String doInBackground(String... arg0) {

            //(...Some calcuations here)

            synchronized (self) {
                self.notify();
            }
            return result;
        }

        @Override
        protected void onPostExecute(String result) {
            textView.setText(result);
            //I would like to notify here, but it is not working
        }
    }

    private void callAsyncTask()
    {
        myTask = (MyTask) new MyTask().execute(someString, someOtherString);

        synchronized (self) 
        {
            try 
            {
                self.wait();
            } catch (InterruptedException e) { e.printStackTrace(); }
        }
    }

    //(...)Some code where I callAsyncTask()

}

Is my understanding of using wait() and notify() correct? Can someone explain me what should I be aware of while using those methods?

Answer 1

just use get() after execute() when you wanna execute the Asynctask

       MyTask mytask=new MyTask (); 
       mytask.execute("arg").get();